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Engine Power Reduced, code P1682

Tiny
AGELZER
  • MEMBER
  • 2009 SATURN AURA
  • 2.4L
  • 4 CYL
  • 2WD
  • AUTOMATIC
  • 138,000 MILES
When I drive the car! Engine power reduced flashes on dash check, engine light comes on and the car goes into limp mode. I took it to dealership and no codes came up for issue. I don't know what to do. The dealership wanted to have a mechanic drive the car with scanner intact until it happens again. They wanted to charge me an additional $119.00 for that. Should I let them do it? This is the code that came up (ignition switch one circuit 2 p1682.)
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Saturday, October 30th, 2021 AT 12:16 PM

15 Replies

Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 109,709 POSTS
Hi,

The code is related to what you mentioned, ignition 1, circuit 2. This could be something as a loose or damaged connector at the ignition switch, the switch itself, or anything that can create a voltage variation between circuits 1 and 2.

Before doing anything, I want you to remove and inspect the ignition 1 powertrain relay. It is located in the fuse box under the hood. Simply remove it, inspect it for corrosion at the connectors, or any evidence that there is damage causing a poor connection. See pic 1 for the relay location.

Now, if everything looks good, switch that relay with a different one under the hood having the same part number and see if the same issue exists. If there isn't one with the same number, here is a link that explains how to test a relay.

https://www.2carpros.com/articles/how-to-check-an-electrical-relay-and-wiring-control-circuit

As far as driving the vehicle with a scanner attached, that could help simply because they want to confirm what leads to the voltage variation. However, that isn't where I would start. I would personally focus on the mechanics of that circuit, wiring, fuse, relay, and so on.

Let me know what you find.

Take care,

Joe

See pic below.
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Saturday, October 30th, 2021 AT 10:00 PM
Tiny
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  • MEMBER
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Okay! Thank you. I will give it try when I get home from work and I will let you know how it goes.
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Sunday, October 31st, 2021 AT 6:15 AM
Tiny
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  • MEMBER
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Hey, i'm missing a relay #26 (front fog) would that play a part in the (engine power reduced). So, I did exactly what you told me to do. I bought some brake cleaner spray, and I switched the fan/#33. I also sprayed some in all the relays except for the fuses, I'll drive it tomorrow and will keep you posted.
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Sunday, October 31st, 2021 AT 11:25 AM
Tiny
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  • MECHANIC
  • 109,709 POSTS
Hi,

I'm not sure using brake cleaner is the best idea. I didn't mention that. Please make sure it has time to completely dry. It is extremely flammable.

As far as the fog light relay is concerned, that wouldn't cause this.

Let me know.

Joe
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Sunday, October 31st, 2021 AT 6:20 PM
Tiny
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  • MEMBER
  • 9 POSTS
So, if that doesn't work, what do you recommend? I was leaning towards having my mechanic look at the following: electronic throttle, (throttle body), pedal position sensor, throttle position sensor, and circuit board.
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Monday, November 1st, 2021 AT 3:13 AM
Tiny
JACOBANDNICKOLAS
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Hi,

Chances are if it is anything with a circuit board, it will be nonrepairable. If you don't find any issues from the things I mentioned, then we need to check the connections at the ignition switch next.

Hang in there. I'll do my best to help.

Take care,

Joe
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Monday, November 1st, 2021 AT 8:19 PM
Tiny
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What about checking the electronic throttle (throttle body) pedal position sensor, throttle position sensor? They are affiliated with the (engine power reduced) correct? And if it was the circuit board then wouldn't nothing be working in the car? I'm assuming!
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Tuesday, November 2nd, 2021 AT 2:23 AM
Tiny
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Is it possible you can send a diagram of the relay part number in the fuse box, so i'll know what part # goes where? The actual part number on the relays.
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Tuesday, November 2nd, 2021 AT 3:48 AM
Tiny
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  • MECHANIC
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Hi,

I checked for a part number, and one isn't listed. I looked through two different manuals, I attached a pic below showing the relays and what they are for.

Let me know if that helps.

Joe

See pic below.
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Tuesday, November 2nd, 2021 AT 5:01 PM
Tiny
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What about checking the electronic throttle (throttle body) pedal position sensor, throttle position sensor? They are affiliated with the (engine power reduced) correct? And if it were the circuit board then wouldn't nothing be working in the car? I'm assuming!
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Tuesday, November 2nd, 2021 AT 6:27 PM
Tiny
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Hi,

The APP sensor diagnostics are based on codes. All codes begin with P2. I attached the information below.

Starting with pic 9, the procedures for testing the TAC system is provided based on your specific code.

Let me know if this helps or if you have other questions.

Take care,

Joe

See pics below.
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Tuesday, November 2nd, 2021 AT 7:09 PM
Tiny
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So, relay #30 is the cool/fan 2 is that the actual blower to the heat/AC?
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Wednesday, November 3rd, 2021 AT 10:12 AM
Tiny
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Hi,

No, cool/fan is a reference to the radiator cooling fan.

Joe
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Wednesday, November 3rd, 2021 AT 5:10 PM
Tiny
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Okay, thanks.
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Wednesday, November 3rd, 2021 AT 5:16 PM
Tiny
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  • MECHANIC
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No problem. Let me know if I can help or if you have questions.

Take care,

Joe
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Wednesday, November 3rd, 2021 AT 5:31 PM

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